3D BPlane Event.
  AfterEvent | Gets or sets the duration after the event that the B-Plane will be displayed. Uses Time Dimension. | 
  AlwaysDisplay | Whether the B-Plane will be displayed throughout the scenario's animation. | 
  BeforeEvent | Gets or sets the duration before the event that the B-Plane will be displayed. Uses Time Dimension. | 
  EventEpoch | Gets or sets the event epoch. Uses DateFormat Dimension. | 





